At this stage ffmpeg rendered a probe.txt produced during the ffprobe step as ansi terminal .jpg frames:

$ ffmpeg -hide_banner -loglevel info -i ../probe.txt -t 1 -f null -
Input #0, tty, from '../probe.txt':
  Duration: 00:00:00.64, start: 0.000000, bitrate: 45 kb/s
  Stream #0:0: Video: ansi, pal8, 640x400, 25 fps, 25 tbr, 25 tbn
Stream mapping:
  Stream #0:0 -> #0:0 (ansi (native) -> wrapped_avframe (native))
Press [q] to stop, [?] for help
Output #0, null, to 'pipe:':
  Metadata:
    encoder         : Lavf59.27.100
  Stream #0:0: Video: wrapped_avframe, pal8(progressive), 640x400, q=2-31, 200 kb/s, 25 fps, 25 tbn
    Metadata:
      encoder         : Lavc59.37.100 wrapped_avframe
frame=   16 fps=0.0 q=-0.0 Lsize=N/A time=00:00:00.64 bitrate=N/A speed= 213x
video:7kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

Output:

unexpected serial console image

This is not useful, but it is quite interesting!